Home / 180.45-249.11-138.87

Finding the Fourth Proportional to 180.45, 249.11 and 138.87

Calculator

Solution

The fourth proportional to 180.45, 249.11 and 138.87 is: 191.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    180.45 : 249.11 = 138.87 : x
  2. Step 2: Convert to fraction form
    180.45/249.11 = 138.87/x
  3. Step 3: Cross multiply
    180.45x = 249.11 × 138.87
  4. Step 4: Simplify right side
    180.45x = 34,593.21
  5. Step 5: Solve for x
    x = 34,593.21/180.45
  6. Step 6: Final answer
    x = 191.71

Related Problems

Find fourth proportional to 90.23, 124.55 and 69.44
Half scale
Find fourth proportional to 360.90, 498.21 and 277.74
Double scale
Find fourth proportional to 181.45, 250.49 and 139.87
Similar ratio
Find fourth proportional to 270.68, 373.66 and 208.31
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.